Lighting fixture having fold-out lamp sockets

ABSTRACT

A fluorescent lamp fixture is provided with fold-out lamp socket assemblies. The socket assemblies are mounted in the ends of a channel member to pivot outwardly from their nested shipping positions and into their extended positions for mounting a lamp therebetween. Each socket assembly is secured in its extended position by means of a latch, and an end plate is provided for insertion into each end of the channel member to close the same. A closure plate extends along and encloses the length of the channel member, and the ends of the closure plate are releasably secured to the socket assemblies by means of locking assemblies.

United States Patent [1 1 Trowbridge Nov. 6, 1973 LIGHTING FIXTURE HAVING FOLD-OUT LAMP SOCKETS [75] Inventor: Charles A. Trowbridge,

Wrightstown, Pa.

[73 Assignee: Sim-Kar Lighting Fixtures Co.,

Philadelphia, Pa.

[22] Filed: Oct. 25, 1972 21 Appl. No.: 300,452

[52] 0.5. CI. 240/51. R, 240/9 R [51] Int. Cl. 05b 33/02 [58] Field of Search 240/5111 R, 9 R,

[56] References Cited UNITED STATES PATENTS 5/1961 Lister et al 240/9 R X 3,070,689 12/1962 McIntosh 2,503,876 4/1950 Kruss 240/5l.1l R

FOREIGN PATENTS OR APPLICATIONS 272,948 3/1966 Australia 240/51.l1 R

655,573 l/l963 Canada 240/5l.l1 R

Primary Examiner-Richard L. Moses Attorney-Dexter N. Shaw-ct al.

[57] ABSTRACT A fluorescent lamp fixture is provided with fold-out lamp socket assemblies. The socket assemblies are mounted in the ends of a channel member to pivot outwardly from their nested shipping positions and into their extended positions for mounting a lamp therebetween. Each socket assembly is secured in its extended position by means of a latch, and an end plate is provided for insertion into each end of the channel member to close the same. A closure plate extendsalong and encloses the length of the channel member, and the ends of the closure plate are releasably secured to the socket assemblies by means of locking assemblies.

10 Claims, 12 Drawing Figures PATENTEDuuv ems 3.770.952 SHEET 18F 3 PATENIEDnuv BIBH sum 2 BF 3 FIGS Flew] a 1 LIGHTING FIXTURE HAVING FOLD-OUT LAMP SOCKETS The present invention relates to lighting fixtures, and more particularly, the present invention relates to lighting fixtures of the type which accept fluorescent lamps. At present, fluorescent lamp fixtures for industrial,

commerical and residential uses are shipped in cartons to electricians for installation. Conventional fixtures which accept straight, elongated lamps have lamp sockets which extend outwardly at right angles to the ends of the fixtures, and the lamp sockets are usually constructed of an insulationmaterial which is relatively brittle. As a result, there is a tendency for the sockets to break when subjected to rough handling, such as encountered during shipment to the place of installation. In addition to the economic loss occasioned by breakage of the sockets, the carton in which the conventional fixture is shipped must be sufficiently large to contain the fixtures with the protruding lamp sockets. A fixture which would be capable of being shipped in a relatively compact carton is highly desirable, not only because the cost of the carton would be reduced, but also because the fixtures could be packed more densely and hence shipped more economically. Furthermore, a fixture which is of simple but rugged construction and.

which is capable of being assembled rapidly by relatively unskilled persons and set-up rapidly by electricians at the installation site is also highly desirable.

With the foregoing in mind, it is a primary object of the present invention to provide a novel fluorescent lamp fixture having lamp sockets which are capable of being nested within the body of the fixture during shipment to reduce the possibility of the sockets being damaged in shipment.

It is another major object of the present invention to provide an improvement fluorescent lamp fixture having fold-out lamp sockets which enable the fixture to be shipped in a compact carton.

As another object, the present invention provides a unique fluorescent lamp fixture having fold-out lamp sockets which enable economies to be realized in the shipment of the fixtures.

It is a further object of the present invention to provide a simple but rugged fluorescent lamp fixture which is capable of being assembled in a rapid manner by relatively unskilled persons.

As a still further object, the present invention provides a fluorescent lamp fixture which is capable of being set-up expeditiously by skilled electricians so as to effect installation economies.

More specifically, the present invention provides a lighting fixture having a channel member and. lamp socket assemblies which are capable of being folded out from the ends of the channel member at the installation site to enable the fixture to be shipped in a compact carton while eliminating potential damage to the lamp sockets in shipment. The channel member has a web with upstanding sides, and each socket assembly has a base mounted between the sides of the channel member and a lamp receptacle extending from the base. Each socket assembly is secured in its extended lamp-mounting position by means of a latch. A removable end plate is provided for closing each end of the 1 channel member and for providing a back-up for the lower portion of the lamp receptacle to lock the lamp receptacle in the fixture. A closure plate is provided for enclosing the channel along its length. The closure plate is releasably fastened at its ends by means of locking assemblies associated with the socket assemblies. The fixtures are shipped with the sockets disposed within the channel; however, the socket assemblies are extended for mounting alamp when they are pivoted outwardly upon removal of the fixture from the shipping carton at the installation site.

These and other objects, features and advantages of the present invention should become apparent from the following description when taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a foreshortened side elevational view of a fluorescent lamp fixture embodying the present invention;

FIG. 2 is a plan view of the fixture of FIG. 1 but with the lamp removed; 7 v

FIG. 3 is an enlarged fragmentary perspective view of a means for releasably fastening a cover plate of the fixture;

FIG. 4 is a side elevatiorlal view of the right-hand portion of the fixture of FIG. 1 with portions broken away to expose a lamp socket assembly disposed in its nested or shipping position;

FIG. 5 is a plan view of the portion of the fixture illustrated in FIG. 4;

FIGS. 6 and 7 are sectional views taken along lines 6-6 and 7-7, respectively, of FIG. 4;

FIG. 8 is a view similar to FIG. 4 but illustrating in full lines a lamp socket assembly in its extended position and illustrating in broken lines the lamp socket assembly in its shipping position;

FIGS. 9 and 10 are enlarged fragmentary sectional views taken along lines 9-9 and 10-10, respectively, of FIG. 8;

FIG. 11 is a greatly enlarged fragmentary perspective view of a preferred means for pivotally mounting each socket assembly in the fixture; and

FIG. 12 is an exploded perspective view of an end portionof the fixture of the present invention, the view illustrating a channel member, a socket assembly and an end closure plate.

Referring now to the drawings, there is illustrated in FIG. 1 a lighting fixture 10 which embodies the present inventionpAs illustrated therein, the fixture 10 has a pair of socket assemblies 11 and 12 provided at opposite ends of the fixture for mounting therebetweena straight fluorescent lamp 13 (illustrated in broken lines). Although the lamp socket assemblies 11 and 12 in the illustrated fixture are located at the ends of the fixture, it shouldbe apparent that socket assemblies may be mounted back to back near the center of the fixture to permit shorter lamps to be utilized or to permit manufacture of longer fixtures. Moreover, it should be apparent that the present invention is applicable to fixtures which mount a plurality of fluorescent lamps in parallel relation.

Accordingto the present invention, the fixture 10 is capable of being disposed in a compact configuration which also protects the socket assemblies 11 and 12 from being damaged in shipment. To this end, the body of the fixture 10 is provided by a channel member 14, and the socket assemblies 11 and 12 are mounted to pivot between a nested shipping position within the I In the illustrated embodiment, the channel member 14 is U-shaped and has a web 14a and parallel upstanding sides 14b and 140. Each socket assembly, such as the right hand assembly 12, has a base 15, and a lamp receptacle or socket 16 extending away from the base 15. As best seen in FIG. 12, the base has a pair of downturned legs 15a and 15b which are mounted between the sides 14b and 140 of the channel 14. The legs 15a and 15b are interconnected by an integral support portion 15c which mounts the lamp receptacle 16.

In order to permit the socket assemblies 11 and 12 to fold into and out of the channel member 14, there is provided means to pivotally connect the base 15 of each socket assembly to the sides 14b and 140 of the channel 14. Preferably, the pivotal connection is provided by means of a protrusion on each leg of the base 15, such as the protrusion on the leg 15a and means 21 in the leg 14b adjacent the web 14a for receiving the protrusion 20. In the illustrated embodiment,'the protrusion is provided by means of a pair of curved leaves 20a and 20b struck outwardly from the leg 15a. The protrusion-receiving means includes an aperture 21 which is shaped at diametrical locations to permit the leaves to be displaced axially through the aperture and which is shaped at other diametrical locations to prevent the leaves from being displaced axially when the receptacle 16 is extended. For instance, see FIGS. 9 and 11 wherein there is illustrated the interlocking engagement of the leaves 20a and 20b with the side 14b of the channel member when the receptacle 16 is extended. With this structure, it is impossible for either of the socket assemblies 11 or 12 to disengage the channel member 14 when in their extended, lamp-mounting positions.

For the purpose of securing the socket assemblies 11 and 12 against inadvertent nesting or folding, there is provided means to latch each of the socket assemblies 11 and 12 in their extended positions. In the illustrated embodiment, the latching means permits the socket assemblies 11 and 12 to pivot clockwise from their nested positions while preventing them from pivoting in the opposite direction from their extended positions. As best seen in FIGS. 8 and 10, the latching function is provided by means of a pair of ears such as the ear 23 struck outwardly from the base-leg 15a and a pair of rectangular apertures such as the aperture 24 provided in the side'l4b of the channel member 14. Each ear 23 and aperture 24 has edges 23a and 24a, respectively, which engage one another when the ear registers in the aperture 24. It is noted that the ear 23 tapers outwardly and upwardly from its point of connection with the leg 14b and the leg 14b is somewhat elastic so that when the socket assembly 12 is pivoted clockwise, the ear 23 maintains the sides 14b and 14c spread apart slightly as illustrated in FIGS. 6 and 7 until the ears 23 register in the apertures 24 and the sides 14b and 140 spring inwardly against the legs 15a and 15b of the base 15 of the socket assembly 12. As best seen in FIGS. 1 and 8, the ear 23 is located between the pivot axis of the base member 15 and the adjacent end of the channel member 14, and the point of connection of the ear 23 and the leg 14b is located between the edge 23a of the car 23 and the web of the channel member 14. As a result, it is impossible for the socket assembly 12 to be pivoted in the opposite or counterclockwise direction unless the sides 14b and 140 are spread apart to disengage the edges 23a and 24a. Thus, inadvertent nesting is prevented.

The ends of the channel member 14 are closed in use. For this purpose, a removable end plate 25 is provided for each end of the channel member 14. As best seen in FIG. 12, the end plate 25 has a central knockout 26 and a lower extension 27. The end plate 25 is secured in positionvby means of a pair of parallel guides 28,28 which are struck upwardly from the web 14a and which slidably receive therebetween the lower extension 27. Detent means in the form of a downwardly-dished dimple 29 in the lower extension 27 mates with a circular aperture 30 in the web 14a. Thus, the end plate 25 may be inserted into and withdrawn from the end of the channel member 14 upon inward and outward displacement axial of the channel member.

It is noted that the upper portion of the end plate 25 is secured to the socket assembly 12 by means ofa pair of upstruck fingers 31,31 which receive a downturned flange 32 on the socket assembly 12 when the socket assembly is in its extended position. For example, see FIG. 8. With this structure, the end plate 25 is securely fastened to the base 15 of the socket assembly 12 when the end plate 25 is inserted and the socket assembly 12 is pivoted into its fully-extended position. It is noted that the lamp receptacle 16 is normally slid into position on the base 15. Thus, when thesocket assembly 12 is pivoted and the end plate 25 locked in place, the receptacle 16 is also locked in place in the fixture 10 by being prevented from moving lengthwise of the fixture 10.

The channel 14 is enclosed along its length. To this end, a channel-shaped cover plate 35 is provided and there is provided means to releasably fasten the ends of the cover plate 35 adjacent the ends of the channel 14. As best seen in FIGS. 1 and 3, the right-hand end of the cover plate 35 is fastened to the right hand socket assembly 12 by means of a pair of upstruck tongues 36,36 (FIG. 2) on the support portion 15c of the base 15 of the socket assembly 12. The other or left hand end of the cover plate 35 is releasably fastened to the lefthand socket assembly 11 by means of a keeper assembly which includes a V-shaped spring member 37 (FIG. 3) having one leg 37a pressed onto a downward offset in the left end of the cover plate 35 and another leg 37b having a free end with a bight 39 for engaging a downwardly offset ledge 38 on the support portion of the left socket assembly 11. Thus,'when the cover plate 35 is displaced downwardly relative to the socket assembly 11, the leg 37b ofthe spring member 37 deflects rightward before its bight 39 snaps onto the ledge 38. Of course, the right end of the cover plate 35 is inserted under the tongues 36,36 before the left end is fastened.

In manufacturing the fixture 10, the socket assem- "blies 11 and 12 are displaced downwardly into the positions illustrated in FIG. 4 until each protrusion 20 registers in its aperture 21. The sides 14b and 14c of the channel member are thereby spread apart slightly as illustrated in FIGS. 6 and 7. The end plate 25 is then installed by sliding its lower extension 27 between the guides 28,28 until the dimples 29 engages in the aperture 30. The fixture 10 is then packed in a carton which is sized to receive the fixture 10 and its cover plate 35.

The fixture 10 is ready for installation by an electrician when it is removed from its shipping carton and the socket assemblies 11 and 12 are pivoted outwardly about their pivot axes into the lamp-mounting positions tendedr 2. Apparatus according to claim 1 wherein said illustrated in FIGS. 1 and 8. The leaves 20a and 20b interengages the sides 14b and 140 of the channel member 14 to securely fasten each socket assembly in the channel member 14, and each ear 23 engages in the associated aperture 24 to latch the socket assemblies in their extended positions. The flange 32 on the base of each socket assembly also engages the fingers 31,31'

on the end plate to secure the end plate 25 in position. The cover plate 35 is installed as described above after the fixture is installed.

In view of the foregoing, it should be apparent that there has now been provided an improved lighting fixture which has fold-out fluorescent lamp sockets. The fold-out sockets are nested within the fixture for shipment in a protected manner in a compact carton.

While a preferred embodiment of the present invention has been described in detail, various alterations, modifications and changes may be made without departing from the spirt and scope of the present invention as defined in the appended claims.

I claim:

I. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations forremovably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legs disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the challel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, said pivot connection including a pair of curved outstruck leaves protruding from one of said members and apertures in the other of said members for receiving said leaves, said apertures being aligned and sized at diametrical locations to pass said leaves axially and sized at other diametrical locations to prevent axial displacement of said leaves relative to said sides when said receptacle is exdownturned legs are disposedbetween the sides of the channel member, and said leaves are struck from said base member and said apertures are in said channel member.

3. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, said latch means including a pair of cars struck from one of said members, and a pair of apertures in the other of said members, said ears and apertures having edges interengaging one another when said receptacle is fully extended and said ears register in said apertures.

4. Apparatus according to claim 3 wherein said ears are struck from said base member and said apertures are in said channel member.

5. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, a removable end plate slidable axially into each end of said channel member, and means releasably fastening each end plate to said channel member, said end plate fastending means including a pair of spaced guides provided in said web adjacent said sides, a lower. extension on said end plate slidable between said guides, and detent means on said lower extension and web cooperating to maintain said end plate in position at the end of the channel member.

6. Apparatus according to claim 5 including means on said base and said end plate cooperatingto fasten said end plate to said base when said base is pivoted and said receptacle extended.

7. Apparatus according to claim 6 wherein said base to end plate fastening means includes a downturned flange on said base and upstruck finger means on said end plate for engaging said flange.

8. A lighting fixture having a channel memberwith a web and upstanding sides, an end plate disposed. transversely to said channel member, and a pair of socket assemblies carried at opposite ends of said channel member for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel memberand a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, means providing a flange on each socket assembly for engaging its associated end plate in abutting relation when said socket is extended, and finger means carried on each end plate for engagingsaid flange to prevent displacement of said end plate axially of said channel member when said socket assembly is extended and latched.

9. 'A lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried adjacent the ends of the channel member for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legs disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, said latch means including an ear struck from one of said members and an aperture in the other of said members for receiving said ear, said ear and'said aperture having interengaging edges located between the pivot axis of said base member and the adjacent end of said channel member with said ear being connected to its member between its edge and the channel web, so that when the edge of said ear engages the edge of said aperture, the base member is secured at two spaced locations against movement transversely of the channel member.

10. A lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legs disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angleto the channel member, said pivot connection including a pair of curved outstruck leaves protruding from one of said members and an aperture in the other of said members for receiving said leaves, said one member having portions extending into said aperture and engaged between said leaves and the member from which the leaves are struck when said base is disposed with the socket assembly in its extended usage position. 

1. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legs disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the challel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, said pivot connection including a pair of curved outstruck leaves protruding from one of said members and apertures in the other of said members for receiving said leaves, said apertures being aligned and sized at diametrical locations to pass said leaves axially and sized at other diametrical locations to prevent axial displacement of said leaves relative to said sides when said receptacle is extended.
 2. Apparatus according to claim 1 wherein said downturned legs are disposed between the sides of the channel member, and said leaves are struck from said base member and said apertures are in said channel member.
 3. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, said latch means including a pair of ears struck from one of said members, and a pair of apertures in the other of said members, said ears and apertures having edges interengaging one another when said receptacle is fully extended and said ears register in said apertures.
 4. Apparatus according to claim 3 wherein said ears are struck from said base member and said apertures are in said channel member.
 5. In a lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, the improvement wherein each of said socket assemblies includes a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, a removable end plate slidable axially into each end of said channel member, and means releasably fastening each end plate to said channel member, said end plate fastending means including a pair of spaCed guides provided in said web adjacent said sides, a lower extension on said end plate slidable between said guides, and detent means on said lower extension and web cooperating to maintain said end plate in position at the end of the channel member.
 6. Apparatus according to claim 5 including means on said base and said end plate cooperating to fasten said end plate to said base when said base is pivoted and said receptacle extended.
 7. Apparatus according to claim 6 wherein said base to end plate fastening means includes a downturned flange on said base and upstruck finger means on said end plate for engaging said flange.
 8. A lighting fixture having a channel member with a web and upstanding sides, an end plate disposed transversely to said channel member, and a pair of socket assemblies carried at opposite ends of said channel member for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, means providing a pivot connection between said base member and said channel member to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, means providing a flange on each socket assembly for engaging its associated end plate in abutting relation when said socket is extended, and finger means carried on each end plate for engaging said flange to prevent displacement of said end plate axially of said channel member when said socket assembly is extended and latched.
 9. A lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried adjacent the ends of the channel member for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legs disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, latch means cooperating with said channel member and said base member to permit said base member to pivot in one direction about its pivot axis for extending the receptacle while preventing said base member from pivoting in the other direction when said receptacle is fully extended, said latch means including an ear struck from one of said members and an aperture in the other of said members for receiving said ear, said ear and said aperture having interengaging edges located between the pivot axis of said base member and the adjacent end of said channel member with said ear being connected to its member between its edge and the channel web, so that when the edge of said ear engages the edge of said aperture, the base member is secured at two spaced locations against movement transversely of the channel member.
 10. A lighting fixture having a channel member with a web and upstanding sides and a pair of socket assemblies carried at spaced locations for removably mounting a lamp therebetween, each of said socket assemblies including a base member mounted to said channel member and a lamp receptacle extending outwardly from said base member, said base member having a pair of downturned legS disposed alongside the channel member, means providing a pivot connection between said base member and said channel member adjacent said web to permit said socket assembly to be disposed in a compact shipping position with said receptacle stowed parallel to the channel member and to permit the socket assembly to be disposed in a usage position with said receptacle extended at an angle to the channel member, said pivot connection including a pair of curved outstruck leaves protruding from one of said members and an aperture in the other of said members for receiving said leaves, said one member having portions extending into said aperture and engaged between said leaves and the member from which the leaves are struck when said base is disposed with the socket assembly in its extended usage position. 